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Brussels: Office for Infrastructures and Logistics, 2008
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Baden-Baden: Nomos-Verl.-Ges., 1992
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Washington, DC: World Bank, 2013 ; 2014
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Washington, D.C: World Bank, c1995 ; Online-Ausg.
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Washington, D.C., U.S.A: World Bank, c1997 ; Online-Ausg.
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Washington, D.C: World Bank, c2002 ; Online-Ausg.
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Elsevier BV, 1992